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    參數(shù)資料
    型號(hào): PSD834312MT
    廠商: 意法半導(dǎo)體
    英文描述: Flash In-System Programmable ISP Peripherals For 8-bit MCUs
    中文描述: Flash在系統(tǒng)可編程ISP的外設(shè)的8位微控制器
    文件頁數(shù): 47/110頁
    文件大?。?/td> 1737K
    代理商: PSD834312MT
    47/110
    PSD813F2, PSD833F2, PSD834F2, PSD853F2, PSD854F2
    80C251
    The Intel 80C251 MCU features a user-config-
    urable bus interface with four possible bus config-
    urations, as shown in
    Table 18., page 48
    .
    The first configuration is 80C31-compatible, and
    the bus interface to the PSD is identical to that
    shown in
    Figure 21., page 46
    . The second and
    third configurations have the same bus connection
    as shown in Figure
    22
    . There is only one Read
    Strobe (PSEN) connected to CNTL1 on the PSD.
    The A16 connection to PA0 allows for a larger ad-
    dress input to the PSD. The fourth configuration is
    shown in
    Figure 23., page 48
    . Read Strobe (RD) is
    connected to CNTL1 and Program Select Enable
    (PSEN) is connected to CNTL2.
    The 80C251 has two major operating modes:
    Page mode and Non-page mode. In Non-page
    mode, the data is multiplexed with the lower ad-
    dress byte, and Address Strobe (ALE/AS, PD0) is
    active in every bus cycle. In Page mode, data (D7-
    D0) is multiplexed with address (A15-A8). In a bus
    cycle where there is a Page hit, Address Strobe
    (ALE/AS, PD0) is not active and only addresses
    (A7-A0) are changing. The PSD supports both
    modes. In Page Mode, the PSD bus timing is iden-
    tical to Non-Page Mode except the address hold
    time and setup time with respect to Address
    Strobe (ALE/AS, PD0) is not required. The PSD
    access time is measured from address (A7-A0)
    valid to data in valid.
    Figure 22. Interfacing the PSD with the 80C251, with One READ Input
    Note: 1. The A16 and A17 connections are optional.
    2. In non-Page-Mode, AD7-AD0 connects to ADIO7-ADIO0.
    ADIO0
    ADIO1
    ADIO2
    ADIO3
    ADIO4
    ADIO5
    ADIO6
    ADIO7
    ADIO8
    ADIO9
    ADIO10
    ADIO11
    ADIO12
    ADIO13
    ADIO14
    ADIO15
    CNTL0(WR)
    CNTL1(RD)
    CNTL2(PSEN)
    PD0-ALE
    PD1
    PD2
    RESET
    32
    26
    27
    28
    29
    30
    31
    43
    42
    41
    40
    39
    38
    37
    36
    24
    25
    33
    A0
    A1
    A2
    A3
    A4
    A5
    A6
    A7
    AD8
    AD9
    AD10
    AD11
    AD12
    AD14
    AD15
    AD13
    A0
    A1
    A2
    A3
    A4
    A5
    A6
    A7
    AD8
    AD9
    AD10
    AD11
    AD12
    AD13
    AD15
    ALE
    RD
    WR
    A16
    AD14
    14
    15
    9
    2
    3
    4
    5
    6
    7
    8
    21
    20
    11
    13
    P1.0
    P1.1
    P1.2
    P1.3
    P1.4
    P1.5
    P1.6
    P1.7
    P3.0/RXD
    P3.1/TXD
    P3.2/INT0
    P3.3/INT1
    P3.4/T0
    P3.5/T1
    X2
    X1
    RST
    EA
    A161
    P0.1
    P0.2
    P0.3
    P0.4
    P0.5
    P0.6
    P0.7
    P0.0
    P2.0
    P2.1
    P2.2
    P2.3
    P2.4
    P2.5
    P2.6
    P2.7
    ALE
    PSEN
    WR
    RD/A16
    PC0
    PC1
    PC2
    PC3
    PC4
    PC5
    PC6
    PC7
    19
    18
    30
    31
    32
    33
    34
    35
    36
    37
    39
    40
    41
    42
    43
    44
    45
    46
    48
    8
    9
    10
    49
    50
    47
    29
    28
    27
    25
    24
    23
    22
    21
    20
    19
    18
    17
    14
    13
    12
    11
    PB0
    PB1
    PB2
    PB3
    PB4
    PB5
    PB6
    PB7
    PA0
    PA1
    PA2
    PA3
    PA4
    PA5
    PA6
    PA7
    7
    6
    5
    4
    3
    2
    52
    51
    80C251SB
    PSD
    RESET
    RESET
    35
    16
    17
    10
    RESET
    AI02881C
    A171
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